This document provides an overview and introduction to building websites with Drupal, an open-source content management system (CMS). It discusses what a CMS is and compares Drupal to WordPress. Key features of Drupal are explained, including its use of modules, entities and fields, content types, taxonomy, and the Views module. Common modules are listed and it is noted that Drupal can be used to build various applications without coding. The document concludes with suggestions for getting started with Drupal development locally and lists resources for learning more.